Path: utzoo!attcan!uunet!lll-winken!ncis.llnl.gov!helios.ee.lbl.gov!pasteur!ucbvax!husc6!bloom-beacon!sparky.UUCP!jdi
From: jdi@sparky.UUCP (John Irwin)
Newsgroups: comp.windows.x
Subject: Re: Help!
Message-ID: <8901292259.AA07177@sparky>
Date: 29 Jan 89 22:59:46 GMT
References: <8901282206.AA00375@EXPIRE.LCS.MIT.EDU>
Sender: daemon@bloom-beacon.MIT.EDU
Organization: The Internet
Lines: 22

Your message:

        Note: This *won't* work if the window in question has a backing-store o
   f
        type Always, and the server has enough resources to retain the window.
        With such a window, you should wait for a MapNotify event before drawin
   g.

    WRONG!  Even with such a window, you get an Expose event, and you should
    drive repaint based on the Expose event.

    (Perhaps you are confused by bugs in the unofficial backing store code that
    people used with R2.)
--------

You are quite correct.  I was actually confused by the different places
where the Exposure event occurs.  Using a normal window, it occurs after
the call to map-window.  Using an :always window, it occurs after the call
to create-window.  So I guess with an :always window the MapNotify always
occurs after the Exposure, which is why I didn't see any lost graphics.

	-- John